From Wetherby
WBS Heck K&A Scrim Adhesive Key Features: 25kg Bag Coverage 3m2 Mineral based, bonding and reinforcing basecoat for Acrylic and Silicone Renders Water repellent properties Vapour Permeable Can be applied to all substrates Masonry, Silicone Calcium Render Boards, Insulation Trowel or Spray applied Pre-mix with water